You cannot be challenged if your status is set to 'away'.

The timezone is set to 'GMT+06:00' which will affect the time set in your calendars and emails.

Challenges expire after 7 days after which it is forfeited and the challenger wins the match.

The challenger cannot challenge more than 3 places above their position.

Max Simultaneous Challenges: One up, one down

If you challenge and lose you will still gain a position.

You cannot challenge the same team/player twice in a row.